The Chinese river dolphin is one of the First-Grade State Protection animals a (an) mamma

问题补充：

The Chinese river dolphin is one of the First-Grade State Protection animals, a (an) mammal with its name – water panda.

A. rare

B. official

C. extreme

D. universal

答案：

(答案→)A. rare

B. official

C. extreme

D. universal

解析：A. rare罕见的，稀少的，B. official正式的，官方的，C. extreme非常的，极度的，D. universal全球的，共同的，句意：中国海豚是国家一级保护动物，一种被叫做水中大熊猫的稀有的哺乳动物。所以选A。